Intervertebral Disc DegenerationIntervertebral DiscIntervertebral Disc DisplacementSpinal DiseasesFibrocartilageLumbar VertebraeGlycosaminoglycansSpinal OsteophytosisAggrecansProteoglycansCollagen Type IIMagnetic Resonance ImagingDisease Models, AnimalChondroitin SulfatesSpineDiskectomyCervical VertebraeLumbosacral RegionCells, CulturedLow Back PainCollagen Type IXWeight-BearingCompressive StrengthIntervertebral Disc ChemolysisSpinal FusionNotochordThoracic VertebraeSpondylolisthesisSacrumRetinal DegenerationDermatan SulfateMacular DegenerationBiomechanical PhenomenaHeparitin SulfateNerve DegenerationExtracellular MatrixSpinal StenosisScoliosisChymopapainExtracellular Matrix ProteinsLordosisKeratan SulfateDiscitisCadaverBack PainLaminectomyHyaluronic AcidHeparin